this code is driving me freakin crazy. i cannot get this thing to clear. its FUEL SUPPLY SYSTEM.. i have a 91 SI with a 91 LS. Some one told me to sand my grounds and i did that . some one told me to change my gas cap and i did that. i change fuel rail. checked all injectors and those rubber gaskets around them.i changed fuel reg and bumped up the pressure. i tried different ECU. also what should the stock pressure be at? thanks !

 

i have a friend with the same problem,**** sucks huh?

 

make sure youir O2 is working.

 

actually its not.ill fix that today.

 

mines throwing the same code, i have to mess with it today to see if i cant get rid of it

 

check my sig for my car. well one day i decided to use a 90 LS ecu unstead of my 91 SI. had more low and mid power but no top end. after the car ran for about 5 mins, i started throwing code 43. car still ran fine for a week. then i decided to go back to my 91 SI ecu. my guess is it has to do with dumping too much fuel.